Average number of segments on an earthworm

It is impossible to provide the exact number of segments on an earthworm. The main idea is that it varies with the species. Believe it or not, there are around 2,200 earthworm species. Keep in mind that some have over one hundred segments. For example, did you know that the common American and European earthworm, Lumbricus terrestris, has about 150 segments? It is widely known the fact that Earthwormsâ€™ bodies are made up of ring-like segments called annuli. It is important to know that the wormâ€™s first segment contains its mouth.